(19)
(11) EP 2 527 281 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.10.2013 Bulletin 2013/44

(43) Date of publication A2:
28.11.2012 Bulletin 2012/48

(21) Application number: 12169035.8

(22) Date of filing: 23.05.2012
(51) International Patent Classification (IPC): 
B66B 5/06(2006.01)
 B66B 5/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 25.05.2011 JP 2011117093

(71) Applicant: Hitachi Ltd.
Tokyo 100-8280 (JP)

(72) Inventors:
  • Sakurai, Kohei
    Tokyo, 100-8220 (JP)
  • Matsubara, Masahiro
    Tokyo, 100-8220 (JP)
  • Yoshikawa, Toshifumi
    Tokyo, 100-8220 (JP)
  • Inoue, Shinsuke
    Tokyo, 100-8220 (JP)
  • Matsudo, Takashi
    Tokyo, 100-8220 (JP)

(74) Representative: MERH-IP Matias Erny Reichl Hoffmann 
Paul-Heyse-Strasse 29
80336 München
80336 München (DE)

   


(54) Elevator


(57) An elevator includes an arithmetic device (32, 37) that incorporates a comparing unit (46) for comparing a car speed V1 calculated by using an encoder signal (28) from an encoder (21) with a car speed V2 calculated by using an acceleration sensor signal (31) from an acceleration sensor (24) installed on a car (1) to detect a failure of the encoder (21) by determining whether a difference between the car speeds V1 and V2 is present in a predetermined range, thereby, a failure diagnosis in the arithmetic device is carried out in low cost and high reliability.







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Search report